I use a homemade headset cup removal tool which has performed perfectly on many occasions so far. Basically it's an old cheap (£5 bargain bin) aluminium handlebar I bought from halfords years ago cut in half. Just make sure you alternate where you hit the cups. It's never failed and never damaged any frames or headsets, probably due to the monkey-metal composition.
I use a homemade headset cup removal tool which has performed perfectly on many occasions so far. Basically it's an old cheap (£5 bargain bin) aluminium handlebar I bought from halfords years ago cut in half. Just make sure you alternate where you hit the cups. It's never failed and never damaged any frames or headsets, probably due to the monkey-metal composition.